what does it mean for DisplayPort to be "open-source"

what is the source of DisplayPort

is it the standard that says "DISTRIBUTION TO NON-MEMBERS IS PROHIBITED" on every page? is this what we call "open-source" now?

@whitequark distribution to non-members* is prohibited

* - of the human species,

@alexandria @whitequark damn, I was really hoping to create a DisplayPort implementation with my cat but if they can't read the spec I guess those plans are dashed
@alexandria @whitequark (to be abundantly clear, I do recognize the actual meaning of the NDA clause and how it hurts independent implementers and I'm not trying to downplay this)